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Primary Codes

541512     Computer Systems Design Services
561621     Security Systems Services

Other Codes

519120     Libraries and Archives
541511     Custom Computer Programming Services
541513     Computer Facilities Management Services
541330     Engineering Services
541519     Other Computer Related Services
541611     Administrative Mgmt. and General Mgmt. Consulting Services
541618     Other Management Consulting Services
541690     Other Scientific and Technical Consulting Services
541712     R&D in the Physical, Engineering, and Life Sciences (except Biotechnology)
541990     All other Professional, Scientific, and Technical Services